350 quid? That's a tiny error! The Woolwich Building Society once tried to repossess my house because of an error 100 times that size! They managed to lose a £35,000 payment which should have paid off the mortgage. When they finally tracked it down they then tried to charge me an extra 200 quid because of the interest that had built up through their own error. When, after me threatening to take the matter to the press, they eventually backed down and I thought that everything was sorted out. A decade later I tried to sell part of my garden to a neighbour, only to find that there was still a charge registered against my property by the Woolwich!!!
Anyway, if you've got a gas meter at your property (even though you don't use gas) you might find that you'll be getting bills in the future anyway. OfGem have forced British Gas to get rid of their tariff which had no standing charge and replace it with one that does. So, through a decision taken by OfGem 'in the interest of consumers' my gas bill is to rise from around £30 per year to about £130. Thank you very much, Ofgem, for 'acting in my interests'!!!